Use Development Team in Maintainer field

From: Michael Prokop <mprokop@sipwise.com>

debian/control

@@ -1,7 +1,7 @@
 Source: ngcp-mediaproxy-ng
 Section: net
 Priority: extra
-Maintainer: Richard Fuchs <rfuchs@sipwise.com>
+Maintainer: Sipwise Development Team <support@sipwise.com>
 Build-Depends: debhelper (>= 5), iptables-dev (>= 1.4), libglib2.0-dev, libpcre3-dev, uuid-dev
 Standards-Version: 3.9.2
 Homepage: http://sipwise.com/